The present invention relates to an electronic device configured for detecting an object, for example a person in the vicinity of the device. The device includes at least one audio signal generator, the generated signals being transmitted through an output interface to a speaker transmitting said mixed signal. The device also including at least one microphone configured to receive signals reflected from said object, and a receiver module for receiving said signals from the microphone, the receiver module also being connected to the output interface for receiving a signal there from corresponding to the signal transmitted through the speaker.

An obstacle detection device according to the present disclosure includes: a transmission circuit, which, in operation, transmits a transmitted wave signal subjected to frequency modulation; a reception circuit, which, in operation, receives a signal externally; an object detection circuit, which, in operation, detects an object existing in a wave transmission direction of the transmitted wave signal, based on a reflected wave of the transmitted wave signal received by the reception circuit; an interference detection circuit, which, in operation, detects, as interference, another transmitted wave signal transmitted from another transmission circuit different from the transmission circuit, based on the signal received by the reception circuit; and a determination circuit, which, in operation, determines a frequency modulation pattern to be applied to the transmitted wave signal and a transmission timing of the transmitted wave signal, based on detection results of the object detection circuit and the interference detection circuit.

An obstacle detection device according to the present disclosure includes: a transmission circuit, which, in operation, transmits a transmitted wave signal subjected to frequency modulation; a reception circuit, which, in operation, receives a signal externally; an object detection circuit, which, in operation, detects an object existing in a wave transmission direction of the transmitted wave signal, based on a reflected wave of the transmitted wave signal received by the reception circuit; an interference detection circuit, which, in operation, detects, as interference, another transmitted wave signal transmitted from another transmission circuit different from the transmission circuit, based on the signal received by the reception circuit; and a determination circuit, which, in operation, determines a frequency modulation pattern to be applied to the transmitted wave signal and a transmission timing of the transmitted wave signal, based on detection results of the object detection circuit and the interference detection circuit.

A object detection device for a vehicle, in which sonars A and C simultaneously transmit sound waves and receive direct waves reflected by objects; a sonar B positioned between the sonars A and C receives indirect waves reflected by the objects; and, when, in a situation where the sonars A and C receive the direct waves and the sonar B receives one indirect wave, a peak value of the indirect wave received by the sonar B is greater than or equal to a predetermined multiplication with respect to peak values of the direct waves received by the sonars A and C, an electronic control unit estimates positions of the objects in detection areas of the sonars A and C based on a flight time of the direct waves received by the sonars A and C, respectively and a flight time of the indirect wave received by the sonar B.

A object detection device for a vehicle, in which sonars A and C simultaneously transmit sound waves and receive direct waves reflected by objects; a sonar B positioned between the sonars A and C receives indirect waves reflected by the objects; and, when, in a situation where the sonars A and C receive the direct waves and the sonar B receives one indirect wave, a peak value of the indirect wave received by the sonar B is greater than or equal to a predetermined multiplication with respect to peak values of the direct waves received by the sonars A and C, an electronic control unit estimates positions of the objects in detection areas of the sonars A and C based on a flight time of the direct waves received by the sonars A and C, respectively and a flight time of the indirect wave received by the sonar B.

A survey system including a multibeam echo sounder having a single projector array and a single hydrophone array constructs a multi-component message for ensonifying multiple fans and deconstructs a corresponding message echo for use in analyzing the returns from each fan.

A survey system including a multibeam echo sounder and a beam selector for selecting beams with the largest amplitudes.

A survey system including a multibeam echo sounder and a beam selector for selecting beams with the largest amplitudes.

A method is disclosed for improving performance of a Sodar system adapted to locate discontinuities in the atmosphere by transmitting pulse compression signals such as plural acoustic chirps. The method comprises transmitting the acoustic chirps, receiving acoustic echoes of the chirps, and processing the acoustic echoes to provide an indication of the discontinuities, wherein the processing includes correcting range or resolution error associated with the acoustic echoes.

A method is disclosed for improving performance of a Sodar system adapted to locate discontinuities in the atmosphere by transmitting pulse compression signals such as plural acoustic chirps. The method comprises transmitting the acoustic chirps, receiving acoustic echoes of the chirps, and processing the acoustic echoes to provide an indication of the discontinuities, wherein the processing includes correcting range or resolution error associated with the acoustic echoes.